Vat dyestuffs and process of making same.



UNITED STATES PATENT OFFICE,

RUDOLF me, or SINDLINGEN, NEAR nocnsr-oN-rrrn-MAm, GERMANY, Assronon 'ro FARIBWEBKE vonm. mnrszrnnnucms & nn'tiivme, OFYEfiCHST-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

VAT DYESTUFFS AND PROCESS OF MAKING- SAMEl No Drawing.

Specification of Letters Iatent. Application filed April 17, 1911. Serial No. 621,670.,

Patented Jan. 23,1912.

corresponds to the general formula:

O I-1,0 (NHCJ-l, halogen) are Valuable yellow vat dyestuffs. These new dyestuffs can be produced by causing a halogen to act upon the benzoquinone-dianilid, obtainable for instance from benzoquinones by the action of anilin. Theyar'e yellowish-brown to brownish-red powders which are insoluble in alcohol, ether and benzene and soluble in hot glacial acetic acid and nitrobenzene with a'brownish-red color; when dissolved in concentrated sulfuric acid they give a violet coloration and when treated with alkaline hydrosulfite they give lightellowish solutions, from which the dyestu can be regenerated by passing air into it. The new dyestuffs dye wool fast yellow tints.

In preparing the new dyestuffs I can, for instance, proceed as follows 12 parts by weight of benzoquinone-dianilid,

soluble in'alcohol, ether and benzene, and forms a brown powder. In concentrated sulfuric acid it dissolves with a violet color. When gently heated with alkaline hydro'sulfite, ityields a lightyellow solution, which dyes wool light-yellow tints, which, on exposure to the air, become deep-yellow tints 4 remarkable for their fast ss.

Having now articula y described my invention, what claim is: v

1. As new products, the benzo'quinonedianilids which are substituted in the anilido groups in para position by halogen,

said products being yellowish-brown to reddish-brown powders, insoluble in alcohol, ether and benzene, soluble in nitrobenzene with a brownish-red color, in concentrated sulfuric acid with a violet color, yielding, when gently heated. with alkaline hydrosulfite, light-yellowish solutions and dyeing wool fast yellow tints;

2. As a new product, the benzoquinonedi-parabromanilid of the formula:

' a pa aa a being a brown powder insoluble in alcohol, ether and benzene, soluble in nitrobenzene with a brownish-red color, in concentrated sulfuric acid with a violet color, yielding, when gently heated with alkaline hydrosulfite, a light-yellowish vat which dyes wool fast aellow tints.

he process of manufacturing new yellow vat dyestuffs, consisting in causing a halogen to act upon the benzoquinone-dianilid (J H OANHC HQ 4. The process of manufacturjig a yellow vat dyestufl, consisting in can mg bromin to act upon benzoquinone-dianilid.

In testimony whereof, I aflix my signature in presence of two witnesses.

RUDOLF MAAG.

Witnesses i JEAN GRUND, CARL GRUND. 

